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functions.php

<?php

// Add this to your theme functions.php:

add_action( 'wp_footer', function() {
    ?>
    <script>
    jQuery(document).ready(function($) {
        var offset = $('mark').first().offset().top // use this line if you use <mark> tags
        var offset = $('.classname').first().offset().top // use this line and change "classname" if you use a CSS class
        $("html, body").animate({ scrollTop: offset }, 100);
    })
    </script>
    <?php
} );